I've just intalled the H&N air filters. I don't know if it just my mind but it seems a little more torqey and I hear a more whiney sound. That being said, what are the performance differences, if any, between the three options?
Seems that the cold air intakes pictures I've seen still take in air the same way as stock but ram air is a more direct and voluminous intake? Besides the different look, what is the difference between the H&N filter and cold air filter results? Don't want to toss away $$ for noth'n!

Yes, I meant K&N. Since I've already opened up the front ducting by drilling holes and installing flex tube, I'm looking only at the air benefit of the K&N vs the cold air and ram. I know the kit you installed and I still might do it if the ram effect is better than the K&N effect. The brake cooling evens out.I've read a few interesting posts on the negative effects (supposed) of the K&Ns.

The kit also come with the K&N filters so your benefit would be the ram air effect.

I did have the K&N filters foul up my MAF.(they were replaced under warranty)

So right now, I'm running the AA CAI with the stock air filters.....Still works well though.

Quote:

Originally Posted by M5ROKIT

Yes, I meant K&N. Since I've already opened up the front ducting by drilling holes and installing flex tube, I'm looking only at the air benefit of the K&N vs the cold air and ram. I know the kit you installed and I still might do it if the ram effect is better than the K&N effect. The brake cooling evens out.I've read a few interesting posts on the negative effects (supposed) of the K&Ns.

Yes, I meant K&N. Since I've already opened up the front ducting by drilling holes and installing flex tube, I'm looking only at the air benefit of the K&N vs the cold air and ram. I know the kit you installed and I still might do it if the ram effect is better than the K&N effect. The brake cooling evens out.I've read a few interesting posts on the negative effects (supposed) of the K&Ns.

Before I got my M5 I owned a '95 540i sport. I was going to switch to the K&N filter to try and up my performance. Here's a web site that I found that made me change my mind. Hope it helps.

I would agree. Even though I have the AA CAI with K&N filters, I wouldn't use them again due to this problem occuring to more than just a few people. I clean my MAF's every 6 months, but I'm probably going to get rid of them and just use the stock filters from now on.

So is the reply to all this by K&N not the truth? Boy, it's really hard to figure out what the real deal is on this issue. I'm thinking as a compromise to put in the K&N for my track days and use the stock when street driving. I would think that where one lives and drives might exacerbate the problem ie dusty Texas, Nevada etc. I live in CT where it is not dusty.

Rob, I seem to recall an article that stated that the stock paper filters flow as well as any after market filter. Maybe it was Dinan who checked this on a dyno. .. perhaps some other board member can help.

As for fouling your MAFS, well there are too many members here who have had that experience and that would be enough for me to stay away from the K&N's..

And then re the Ram Air effect.. just my opinion, but I figure for the AA system to really work, you would have to driving a little faster than the 55mph limit we are allowed to drive before you got any benefit...
I would install it only for the eye candy appeal and any hp boost that resulted would be cream for me ..

Rob, I seem to recall an article that stated that the stock paper filters flow as well as any after market filter. Maybe it was Dinan who checked this on a dyno. .. perhaps some other board member can help.

As for fouling your MAFS, well there are too many members here who have had that experience and that would be enough for me to stay away from the K&N's..

And then re the Ram Air effect.. just my opinion, but I figure for the AA system to really work, you would have to driving a little faster than the 55mph limit we are allowed to drive before you got any benefit...
I would install it only for the eye candy appeal and any hp boost that resulted would be cream for me ..

Not a really good example...but...doesn't Dinan use K&Ns with blue dye on all of their CAIs?

Register Now

In order to be able to post messages on the BMW M5 Forum and M6 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:

Password

Please enter a password for your user account. Note that passwords are case-sensitive.

Password:

Confirm Password:

Email Address

Please enter a valid email address for yourself.

Email Address:

Log-in

User Name

Remember Me?

Password

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Everything Copyright 2000-2008. Do not use ANYTHING from this site without written permission. All images, graphics, sound files, video files and text appearing on this web site are the exclusive property of m5board.com and are protected under international copyright laws. All images, graphics, sound files, video files and text on this site are for on-screen and on-site viewing and listening only. No part of this web site may be reproduced, copied, saved, stored, manipulated, or used in any form for personal or commercial purposes without the prior written permission of m5board.com. Use of any image or graphic as the basis for another photographic concept or illustration is a violation of the copyright. Any copyright infringement will be prosecuted to the full extent of federal and international copyright laws. M5board.com is an enthusiast board and we don't condone any dangerous activity. Our airfield events are completely safe based on years of experience, we conduct them during clear visibility with mature participants that have several years of experience with high-performance automobiles, large unobstructed run-off zones on sealed off private former military airbases and we clearly mark the braking zones. If inexperienced with high speed driving we do not recommend organizing your own event but attending a high-performance driving school. The use of the term "BMW" on this site is for reference only, and does not imply any connection between m5board.com and BMW AG or BMW North America.